This book discusses the CAPTCHA (completely automated public Turing test to tell computers and humans apart), an artificial-intelligence-based test commonly used on websites for preventing security attacks, covering its foundations, the main trends and challenges, as well as innovative features and research aspects. It focuses on the recently proposed CAPTCHAs, introducing research approaches for analyzing of the usability of the CAPTCHA test for Internet users. The book enables readers to become familiar with the CAPTCHA technology from the user’s perspective, from the basic concepts underlying the test to more advanced concepts. It is intended for students as well as graduates wanting to gain insights into new CAPTCHA designs as well as new research directions.

This book constitutes the proceedings of the 16th International Conference on Information Systems Security, ICISS 2020, held in Jammu, India, during December 16-20, 2020. The 11 regular papers, 2 short papers and 3 work-in-progress papers included in this volume were carefully reviewed and selected from a total of 53 submissions. The papers were organized in topical sections named: access control; AI/ML in security; privacy and Web security; cryptography; and systems security.

This book provides state-of-the-art coverage of the principles, techniques, and management of issues in cyber security, including threat attacks, privacy, signature and encryption schemes. One of the most important topics addressed concerns lightweight solutions for public key encryption in resource-constrained environments; the book highlights the latest developments in this area. Authentication is another central issue in cyber security. In this book, we address this aspect and sub-aspects ranging from cryptographic approaches to practical design issues, such as CAPTCHA. Privacy is another main topic that is discussed in detail, from techniques for enhancing privacy to pseudonymous schemes. Addressing key issues in the emerging field of cyber security, this book effectively bridges the gap between computer security and threat attacks, and showcases promising applications involving cryptography and security.

Mixed Methods Perspectives on Communication and Social Media Research addresses the need for a discipline-cum-methodology-tailored book that navigates the current research spectrum of communication and social media ("CommSocMed"). It examines contemporary and relevant issues that intertwine the expansive spheres of CommSocMed. Authored by professionals with extensive academic and in-depth research and industry experience, the book highlights research-based themes that mirror qualitative and quantitative methodologies vis-à-vis socio-cultural, political, educational, and organisational issues and challenges. The first two sections present the mutually interwoven disciplines of CommSocMed where research works cover a comprehensive range of designs such as narrative analysis, case study, recombinant memetics, discourse analysis, visual semiotics, ethnography, content analysis, feminist theory, descriptive-survey, descriptive-correlational, model-building/testing, experimental, and mixed methods. The third section is a concluding segment which synthesises all the scholarly contributions in this volume. This book will serve as an authoritative reference for mixed methods research in CommSocMed and will be highly relevant reading for academics, researchers, postgraduate students and undergraduates in communication (for example, instructional communication, marketing communication, organisational communication, political communication, strategic communication), social media, and social sciences.

The four-volume set LNCS 8117-8120 constitutes the refereed proceedings of the 14th IFIP TC13 International Conference on Human-Computer Interaction, INTERACT 2013, held in Cape Town, South Africa, in September 2013. The fourth volume includes 38 regular papers organized in topical sections on supporting physical activity, supporting shred activities, sustainability, tabletop computing, text comprehensibility, tracking eyes and head, usability evaluation and technology acceptance, user preferences and behaviour, user requirements capture and analysis, UX in work / educational context, voice / sound-based computing, 31 interactive posters, 2 industrial papers, 4 panels, 1 contribution on special interest groups, 1 tutorial, and 9 workshop papers.

This open access book provides researchers and professionals with a foundational understanding of online privacy as well as insight into the socio-technical privacy issues that are most pertinent to modern information systems, covering several modern topics (e.g., privacy in social media, IoT) and underexplored areas (e.g., privacy accessibility, privacy for vulnerable populations, cross-cultural privacy). The book is structured in four parts, which follow after an introduction to privacy on both a technical and social level: Privacy Theory and Methods covers a range of theoretical lenses through which one can view the concept of privacy. The chapters in this part relate to modern privacy phenomena, thus emphasizing its relevance to our digital, networked lives. Next, Domains covers a number of areas in which privacy concerns and implications are particularly salient, including among others social media, healthcare, smart cities, wearable IT, and trackers. The Audiences section then highlights audiences that have traditionally been ignored when creating privacy-preserving experiences: people from other (non-Western) cultures, people with accessibility needs, adolescents, and people who are underrepresented in terms of their race, class, gender or sexual identity, religion or some combination. Finally, the chapters in Moving Forward outline approaches to privacy that move beyond one-size-fits-all solutions, explore ethical considerations, and describe the regulatory landscape that governs privacy through laws and policies. Perhaps even more so than the other chapters in this book, these chapters are forward-looking by using current personalized, ethical and legal approaches as a starting point for re-conceptualizations of privacy to serve the modern technological landscape. The book's primary goal is to inform IT students, researchers, and professionals about both the fundamentals of online privacy and the issues that are most pertinent to modern information systems. Lecturers or teachers can assign (parts of) the book for a “professional issues” course. IT professionals may select chapters covering domains and audiences relevant to their field of work, as well as the Moving Forward chapters that cover ethical and legal aspects. Academics who are interested in studying privacy or privacy-related topics will find a broad introduction in both technical and social aspects.

This book constitutes the proceedings of the 10th International Conference on Information Security Practice and Experience, ISPEC 2014, held in Fuzhou, China, in May 2014. The 36 papers presented in this volume were carefully reviewed and selected from 158 submissions. In addition the book contains 5 invited papers. The regular papers are organized in topical sections named: network security; system security; security practice; security protocols; cloud security; digital signature; encryption and key agreement and theory.